Effect of spatial coherence on laser beam self-focusing from orbit to the ground in the atmosphere.
Effect of spatial coherence on laser beam self-focusing from orbit to the ground in the atmosphere.
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DOI：
10.1364/oe.24.014429
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发表时间：
2016-06
期刊：
影响因子：
3.8
通讯作者：
Hanling Deng;X. Ji;Xiaoqing Li;Hao Zhang;Xianqu Wang;Yuqiu Zhang
中科院分区：
文献类型：
--
作者：
Hanling Deng;X. Ji;Xiaoqing Li;Hao Zhang;Xianqu Wang;Yuqiu Zhang
研究了空间相干性对激光在大气中自聚焦的影响，以辅助强激光束从轨道向地面传输。研究发现，与部分（空间）相干光束（PCB）相比，全相干光束在地面上的压缩强度更大，但由于自聚焦效应，PCB在地面上的压缩光斑尺寸可能减小到衍射极限以下，并且PCB比全相干光束具有更高的阈值临界功率。此外，还提出了一种有效的PCB板从轨道传输到地面的最大压缩无束裂设计准则。
The effect of spatial coherence on laser beam self-focusing in the atmosphere to assist delivering powerful laser beams from orbit to the ground is studied. It is found that a fully coherent beam is more strongly compressed on the ground than a partially (spatial) coherent beam (PCB), even so, for a PCB the compressed spot size on the ground may be reduced below the diffraction limit due to self-focusing effect, and a PCB has higher threshold critical power than a fully coherent beam. Furthermore, an effective design rule for maximal compression without beam splitting of the transported PCB from orbit to the ground is presented.